Blending coal combustion technology is commonly used in coal-fired power stations, and the combustion interactions (i.e., the ignition promotion and burnout inhibition) during blended coal combustion affect their combustion characteristics. The combustion interactions under conventional air-fuel condition have been well studied. Oxy-fuel firing considerably differs from air-fuel combustion and the combustion interactions of blended coals in O₂/CO₂ atmospheres have been investigated in our previous research. However, the H₂O concentration in actual oxy-fuel condition is relatively high, which may influence the combustion interactions. This study further investigates the effect of H₂O on the combustion characteristics and interactions of blended coals in O₂/H₂O/CO₂ atmospheres. The results show that adding H₂O into the oxy-fuel atmosphere remarkably affects the combustion characteristics with the more notable ignition delay, faster burnout and better comprehensive combustion characteristics (CCI). In addition, the presence of H₂O strengthens the ignition promotion, the burnout inhibition and the comprehensive interactions, resulting in the more obvious non-additive behaviors of CCI. In O₂/H₂O/CO₂ mixtures, enhancing the H₂O/CO₂ ratio slightly strengthens the ignition promotion, the burnout inhibition, and the comprehensive interactions, which increases the non-additive behaviors of CCI. Furthermore, both of increasing O₂/H₂O or O₂/CO₂ ratios significantly weaken the ignition promotion, strengthen the burnout inhibition and the comprehensive interactions, which increases the non-additive behaviors of CCI. The findings shed light on the interaction effects observed during blended coal combustion in O₂/H₂O/CO₂ mixtures, which can provide useful information to improve the combustion characteristics of the blended coals in the real oxy-fuel atmospheres.

混煤燃烧技术通常用于燃煤电站，混煤燃烧过程中的燃烧相互作用（即点火促进和燃尽抑制）会影响其燃烧特性。常规空气-燃料条件下的燃烧相互作用已得到很好的研究。含氧燃料燃烧与空气燃料燃烧有很大不同，在我们以前的研究中已经研究了混合煤在O ₂ / CO ₂气氛中的燃烧相互作用。但是，实际含氧燃料条件下的H ₂ O浓度较高，可能会影响燃烧相互作用。这项研究进一步研究了H ₂的作用O对O ₂ / H ₂ O / CO ₂气氛下混合煤的燃烧特性和相互作用的影响。结果表明，向含氧燃料气氛中添加H ₂ O对燃烧特性有显着影响，点火延迟更明显，燃尽更快，综合燃烧特性（CCI）更好。此外，H ₂ O的存在增强了点火促进，燃尽抑制和全面的相互作用，从而导致CCI的非加性行为更加明显。在O ₂ / H ₂ O / CO ₂混合物中，增强H ₂ O / CO₂比略微增强了点火促进，燃尽抑制和全面的相互作用，从而增加了CCI的非累加行为。此外，增加的O ₂ / H ₂ O或O ₂ / CO ₂比值都显着削弱了点火促进作用，增强了燃尽抑制和全面的相互作用，从而增加了CCI的非累加行为。这些发现揭示了混合煤在O ₂ / H ₂ O / CO _2中燃烧时的相互作用。 混合物，可以提供有用的信息，以改善掺混煤在实际含氧燃料气氛中的燃烧特性。